过氯乙烯清漆超临界二氧化碳喷涂的研究  

Supercritical carbon dioxide spraying with vinyl perchloride varnish

作　　者：李冬旭 银建中[1] LI Dong-xu;YIN Jian-zhong(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《现代化工》2020年第4期129-132,共4页Modern Chemical Industry

基　　金：国家自然科学基金(U1662130)。

摘　　要：采用超临界二氧化碳替代涂料中的挥发性有机化合物达到保护环境的目的。以过氯乙烯清漆为原料,探究温度、压力、清漆质量分数(清漆质量占清漆与超临界二氧化碳混合物的质量比)和喷涂距离(基板和喷枪之间距离)对喷涂效果的影响。结果表明,清漆质量分数是高度显著性因素,随清漆质量分数的减少,喷涂液滴尺寸减小;压力是具有一定影响的因素,随着压力的升高,喷涂液滴尺寸减小;温度和喷涂距离对喷涂无显著影响。通过喷涂获得的涂膜可以通过国标实验。通过测量黏均分子质量与红外光谱分析表明,超临界二氧化碳不影响涂料中的成膜物质性质。Supercritical carbon dioxide( scCO2) can be used to replace volatile organic compounds( VOCs) in coatings field to achieve environmental protection. Using vinyl perchloride varnish as raw materials,the influences of temperature,pressure,varnish content( the mass ratio of varnish to mixture of varnish and supercritical carbon dioxide)and spraying distance( between substrate and spraying gun) on spraying efficiency are studied. It is found from the orthogonal experimental design that the influence of varnish content is a highly significant factor.As it decreases,the size of coating droplet decreases.Pressure has a certain impact.As the pressure increases,the size of coating droplet decreases.Temperature and spraying distance have less influence on the size of coating droplet. The coating film obtained by spraying can meet the national standard.Finally,through measuring the molecular weight and infrared spectrum of vinyl perchloride varnish,it can be concluded that scCO2 has no effect on the properties of film forming substances.

关 键 词：超临界二氧化碳 过氯乙烯清漆 喷涂 挥发性有机化合物 黏均分子质量 

分 类 号：TQ630.7[化学工程—精细化工]